The way to a healthy garden is to feed the soil and build the ecosystem.  Growing cover crops and compost crops in your garden will help you do just that and set you on the path to sustainability.  Watch through the seasons as the crops come to maturity and are either cut as mulch in the beds they are grown in, or cut as food for the compost pile.  This video demonstartes how to manage cover crops and compost crops using only hand tools.